>>> On Thu, 6 May 2021 13:09:53 +0800, d tbsky <tbskyd@xxxxxxxxx> said: > Hi: I am curious about raid10 redundancy when created with > disk numbers below: [...] This looks like a "homework" question... There are a lot of pages on the WWW that explain that in summary and detail, and the shortest is: RAID10 only loses data if all devices that compose one of mirror set become impaired at the same block addresses. More in detail I have written some posts that explain the tradeoffs involved, they seem to be widely "misunderestimated": https://sabi.co.uk/blog/13-one.html?130117#130117 "Comparing the resilience of RAID6 and RAID 10" http://www.sabi.co.uk/blog/12-two.html?120218#120218 "When double parity may make some sense"
